# Chem Exam3

version from 2017-12-11 21:11

## Section

What is the relationship between the wavelength and the frequency of radiant energyThe equation that relates wavelength and frequency for electromagnetic waves is: λν=c where λ is the wavelength, ν is the frequency and c is the speed of light
Ozone in the upper atmosphere absorbs energy in the 210-230 nm range of the spectrum. In what region of the electromagnetic spectrum does this radiation occurUV (ultraviolet)
true or false, Ultraviolet light has longer wavelengths than visible lightfalse
true or false, X- rays travel at same speed as microwavestrue because all EM radiation travels at the speed of light.
T or F, The frequency of radiation DECREASES as the wavelength increasesT
website to reviewhttp://users.stlcc.edu/mhauser/hw6.pdf
T or F, Electromagnetic radiation travels through a vacuum at a constant speed, regardless of wavelengthT
Infrared light has a lower/higher frequency than visible lightlower which means it has a higher frequency
frequency formulav = c / λ = wave speed c (m/s) / wavelength λ (m)
what is c (speed of light)2.998×10^8 m/s
nm to m x 10^9
Would radiation with a wavelength 0.89 nm or a frequency of 5.6×1011 s−1 be detected by an X-ray detectorX-ray radiation has wavelengths that generally fall between 10−8 and 10−12 m. Radiation with a wavelength of 0.89 nm can be classified as X-ray radiation, whereas the wavelength corresponding to the frequency 5.6×1011 s−1 would be classified as infrared radiation
ps to spicosecond to second is ps x (1 x 10^-12)
distance formulaspeed x time
what was the first important application of Planck's quantum hypothesisEinstein's 1905 paper on the photoelectric effect
Explain how Einstein utilized Planck's quantum concept in explaining the photoelectric effectPlanck figured out that light was made of particles, and said energy of a quantum = planck's constant*frequency of emitted radiation. Einstein said: 'okay, He then used Planck's idea to figure out that the energy of a photon depended on its frequency. The logical conclusion was that a given photon must have enough energy to free an electron from the atom-hence, the wave form must have a certain frequency
formulas used to calculate the energy of a photon of electromagnetic radiationE=hf or E=(hc)/λ (h is Planck's Constant, f is the frequency, c is the speed of light, and λ is the wavelength of the radiation)
unit for energyJ
planck's constant6.63×10^−34
µm to mx 10^-6
wavelength symbollambda
1 mole photons6.022×10^23 photons
energy of a mole photonfind J then multiply J by 6.022×10^23
123456.7 w/ 3 sig fig1.23 x10^5 (positive exponent when going to the right to find the expanded number)
mj to jx10^-3
what is Zeffeffective nuclear charge
Atomic radius increases as you moveright to left across the periodic table. It also increases as you move top to bottom, making francium the largest element
In an uncharged atom, the atomic number is also equal tothe number of electrons
The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of an atom, It is identical tothe charge number of the nucleus
search quizlet forchem exam 3, same for final
chap 7 quiz in powerpoint slide92